Why did old american movies sound so different?

Whenever I watch old movies the characters always have a different tone than they have now. It seems to have changed somewhere from the 2000s. Is it just me or did something change?

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tl;dr: Because of technological advancements in recording equipment.

Maybe this Helps: Why we all need subtitles now

Here I am thinking I was the only one with this problem. I'm at the office and can't watch the video itself, but I definitely will tonight. Thank you for sharing!

Anakin Padme meme.jpg:

I’ve invented new mic tech!

You’re going to use that to make audio more intelligible right?

Right?!

This was awesome, thank you